Improvement in lamp-chimneys



'0. D. WARFIELD. I

Lamp-Chimney.

N0.163'826 Patehted May 25,1875.

- WITNESSES w '6 WINV NTOR Y ATTORNEYS THE GRAPHIC Cl").PHOTO-LITH.39&4IPARK PUcLN-Y.

UNITED STATES PATENT OFFICE.

OLIVER D. WARFIELD, OF UHIOOPEE FALLS, MASSACHUSETTS, ASSIGNOR OFONE-HALF HIS RIGHT TO JOHN ANDERTON, OF SAME PLACE.

IMPRO VEMENT IN LAMP-CHIMNEYS.

Specification forming part of Letters Patent No. 163,826, dated May 25,1875 application filed May 9, 1874.

To all whom it may concern:

Be it known that I, OLIVER D. WARFIELD, of 'Ohicopee Falls, in thecounty of Hampden. and State of Massachusetts, have invented a newandvaluable Improvement in Lamp-Chimhe, s; and I do hereby declare thatthe following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to theannexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon;

Figure 1 of the drawing is a representation of an outside view of mylamp-chimney, and Fig. 2 is a view of one section. Fig. 3 is a sectionalview.

This invention has relation to sectional lampchimneys; and it consistsin the construction and novel arrangement of such a chimney in twovertical sections, fitted to each other on opposite sides of saidchimney by contactedges, which are provided, respectively, with roundedor wave-like vertical ribs and correspondin g channels, forming tongue-an dgroove joints, whereby the sections are adapted to be cast truein glass, and are prevented from becoming laterally displaced, and theupward draft of air through the chimney is protected from counteractinglateral currents, as hereinafter more fully described.

In the accompanying drawings, the letter A designates the two verticalsections which compose the chimney. B represents the contact-edges ofthe sections, which may be similar in form, and cast from a pattern of asingle section. One of the contact-edges, which are usually made broad,is provided with a rib, a, of rounded contour in crosssection, andconnected with the contact-face by rounded angles. The othercontact-face of the section is provided with a groove, 1), ofcorresponding rounded form, adapted to fit neatly a rib, a.

Usually both rib and groove are made straight in the direction of theirlength, as shown in the drawings; but they may have a certain amount ofcurvature, if thought desirable. A straight rib is more apt to preserveits form during annealing, and, therefore will usually fit its groovequite accurately. The rounded form of both rib and groove can be cast inglass with certainty, and therefore this form is also preferable, with aview to accuracy of contact in the joint, which is of especialimportance with relation to the draft.

Near the upper and lower edges of the sections are formed the slightgrooves c, on the outside, serving as bearings for the bindingsprings S,which hold the sections together, and prevent longitudinal displacement.

I am well aware that sectional lamp-chimneys are not new, aad that it isnot new to provide the sections with beveled contactfaces; therefore Ido not claim such invention.

What I claim as new, and desire to secure by Letters Patent, is

A lamp-chimney section. having straight vertical edges, one of which isprovided with a rounded rib or bead, centrally arranged on the edge, andthe other of which is provided with a correspondingly-munded channel, asherein shown and described.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

OLIVER D. WARFIELD.

Witnesses:

GEo. S. TAYLOR, FRED. N. NITHREL.

